Chemistry-Cross

5. number of protons
8. A part of the cell containing DNA and RNA and responsible for growth and reproduction
9. one or two letters
11. negatively charged particle
12. A subatomic particle that has no charge and that is found in the nucleus of an atom
13. An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
15. A substance that cannot be broken down into simpler substances

1. Number of protons and neutrons
2. positively charged particle
3. anything that takes up space and has mass
4. electrons in the outermost shell
6. An atom or group of atoms that has a positive or negative charge.
7. small particle
10. model of an atom that shows electrons in circular orbits around the nucleus
11. an energy level of electrons at a characteristic average distance from the nucleus of an atom
14. eye cavity